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Diffstat (limited to 'kernel/arch/mn10300/include/asm/processor.h')
| -rw-r--r-- | kernel/arch/mn10300/include/asm/processor.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/kernel/arch/mn10300/include/asm/processor.h b/kernel/arch/mn10300/include/asm/processor.h new file mode 100644 index 000000000..769d5ed8e --- /dev/null +++ b/kernel/arch/mn10300/include/asm/processor.h @@ -0,0 +1,178 @@ +/* MN10300 Processor specifics + * + * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#ifndef _ASM_PROCESSOR_H +#define _ASM_PROCESSOR_H + +#include <linux/threads.h> +#include <linux/thread_info.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#include <asm/cpu-regs.h> +#include <asm/uaccess.h> +#include <asm/current.h> + +/* Forward declaration, a strange C thing */ +struct task_struct; +struct mm_struct; + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +#define current_text_addr() \ +({ \ + void *__pc; \ + asm("mov pc,%0" : "=a"(__pc)); \ + __pc; \ +}) + +extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size); + +extern void show_registers(struct pt_regs *regs); + +/* + * CPU type and hardware bug flags. Kept separately for each CPU. + * Members of this structure are referenced in head.S, so think twice + * before touching them. [mj] + */ + +struct mn10300_cpuinfo { + int type; + unsigned long loops_per_jiffy; + char hard_math; +}; + +extern struct mn10300_cpuinfo boot_cpu_data; + +#ifdef CONFIG_SMP +#if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8 +# error Sorry, NR_CPUS should be 2 to 8 +#endif +extern struct mn10300_cpuinfo cpu_data[]; +#define current_cpu_data cpu_data[smp_processor_id()] +#else /* CONFIG_SMP */ +#define cpu_data &boot_cpu_data +#define current_cpu_data boot_cpu_data +#endif /* CONFIG_SMP */ + +extern void identify_cpu(struct mn10300_cpuinfo *); +extern void print_cpu_info(struct mn10300_cpuinfo *); +extern void dodgy_tsc(void); + +#define cpu_relax() barrier() +#define cpu_relax_lowlatency() cpu_relax() + +/* + * User space process size: 1.75GB (default). + */ +#define TASK_SIZE 0x70000000 + +/* + * Where to put the userspace stack by default + */ +#define STACK_TOP 0x70000000 +#define STACK_TOP_MAX STACK_TOP + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE 0x30000000 + +struct fpu_state_struct { + unsigned long fs[32]; /* fpu registers */ + unsigned long fpcr; /* fpu control register */ +}; + +struct thread_struct { + struct pt_regs *uregs; /* userspace register frame */ + unsigned long pc; /* kernel PC */ + unsigned long sp; /* kernel SP */ + unsigned long a3; /* kernel FP */ + unsigned long wchan; + unsigned long usp; + unsigned long fpu_flags; +#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */ +#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */ + struct fpu_state_struct fpu_state; +}; + +#define INIT_THREAD \ +{ \ + .uregs = init_uregs, \ + .pc = 0, \ + .sp = 0, \ + .a3 = 0, \ + .wchan = 0, \ +} + +#define INIT_MMAP \ +{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \ + NULL, NULL } + +/* + * do necessary setup to start up a newly executed thread + */ +static inline void start_thread(struct pt_regs *regs, + unsigned long new_pc, unsigned long new_sp) +{ + regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM; + regs->pc = new_pc; + regs->sp = new_sp; +} + + +/* Free all resources held by a thread. */ +extern void release_thread(struct task_struct *); + +/* + * Return saved PC of a blocked thread. + */ +extern unsigned long thread_saved_pc(struct task_struct *tsk); + +unsigned long get_wchan(struct task_struct *p); + +#define task_pt_regs(task) ((task)->thread.uregs) +#define KSTK_EIP(task) (task_pt_regs(task)->pc) +#define KSTK_ESP(task) (task_pt_regs(task)->sp) + +#define KSTK_TOP(info) \ +({ \ + (unsigned long)(info) + THREAD_SIZE; \ +}) + +#define ARCH_HAS_PREFETCH +#define ARCH_HAS_PREFETCHW + +static inline void prefetch(const void *x) +{ +#ifdef CONFIG_MN10300_CACHE_ENABLED +#ifdef CONFIG_MN10300_PROC_MN103E010 + asm volatile ("nop; nop; dcpf (%0)" : : "r"(x)); +#else + asm volatile ("dcpf (%0)" : : "r"(x)); +#endif +#endif +} + +static inline void prefetchw(const void *x) +{ +#ifdef CONFIG_MN10300_CACHE_ENABLED +#ifdef CONFIG_MN10300_PROC_MN103E010 + asm volatile ("nop; nop; dcpf (%0)" : : "r"(x)); +#else + asm volatile ("dcpf (%0)" : : "r"(x)); +#endif +#endif +} + +#endif /* _ASM_PROCESSOR_H */ |